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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3e71fcc7328fbc891e7bb13b5b666f6d2cdc2d8607680a90cfe104007404030' 
  AND token = 'yYZ9moc4+4Xo2wt19pbPWF5kh1QD1/O0dUMxomXo1K8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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