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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3153914595ac03b907cb45f661d18da6b725262c3d8b6f89653c37b34a71a4b' 
  AND token = 'LfczR6940rQUPuKnPa+JZ/Ca+MnpR3QYslms1T3j0MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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