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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2867bb2cb19a83c97d2b5952405b11eeab2d46c7c14bd132582266552e779bd2' 
  AND token = 'WuTB60cRact7GeFjV4pJYyHJT6fdiGKtRH/pDL2poJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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