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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3487a126fa8ffc07ed5dce2f361a68ffc985c1bd99bc8c67bf2e8009ce14e24' 
  AND token = 'EyGp1wnVe5gthzkLf5N99UFaf48485k0eBC1RDfWrDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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