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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca598db474788f05c4fbeab34b5f8a34ce00297c2af68e50d1dad4071ac66134' 
  AND token = 'Vmsw5Ifa0N+ewMXwazr9QUj6v4JAV1YbFFs1tW9+elg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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