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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10ef8e40c5f96209ab7fce17b752ba47a41cd259d2040c7a2366cb2fcaa5c924' 
  AND token = 'foIbauj5k2haSTn71Q2fobJjHh0jFIyzv//PkKIUewU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}