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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3f2b6084af13888b9caed3f9533d07ee49cf12bc0137fafdcf33928d88d076f' 
  AND token = '8CpP6x9414bdaXCPS/nIZexxIcDpogZNg4/V+rj6CsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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