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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee9643ac13015a76732a07f283d9fc758b68dd6756879c7f3c7aeae8dea2cca4' 
  AND token = 'GPV1dLUZ9yADaB5H4prTbqMYq3k1Hkj9/1f/6dn16c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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