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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8696db4cbdab390e4c6b7e49a55bf4e72a722e5cae23ddad9cc1dc7e4d795177' 
  AND token = 'oIW1mekI0Uwd78MILD3Kgba7iHm1nIgGYykOUB0ZbC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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