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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a69c60e828369aafbfa75001e7beaf58f7ac21c30783a662dd40e3e94aa4b061' 
  AND token = '1qcnW788sUXebbMJGuxhCX1Ccvo8I9XZoTNhjvHg6mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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