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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e416680b34c6351e5c97b493f9f75ddfc419ce2bdc6a6e44407f7424ba46ab92' 
  AND token = 'Rs6hTBJjKPFL3Mh3fG3919AUEM7Kkl3gNCAiqelqo0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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