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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dded1befa38b4ca417f373f2fc61e2c084e5d0acdec3e2fb7a65b60d9459c00a' 
  AND token = '8y71AR6YNuAjhZsh4Naj6dfXlapHa8d7sEzMv/46YD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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