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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f3790f47463d5d5a1639b9f60c3ab7378b8c6e6099a60e47688df9ca5d61aa1' 
  AND token = '0QLKR/FPLpLDSSqsu+U7eceePB/iLwQDQlla2QPMzoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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