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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f09c576665b94ef434dd97cc75700036a5d9dc1361b8c1eef43387b88c39513' 
  AND token = 'rlYFtlD2xVmTjGc8S6D85MbXUbiXRH4Rw4brlCVATKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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