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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f85d6709adabf086d2a5f84e2e7b44deece6104b0a67bd6d240c4c9936ec986' 
  AND token = '2EdbPIpUNSfxbJwXriofrNar8ETsdgmV8qV/3saUqWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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