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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '892bae89784f41c4149ac32daa194f1fc5a90ba85e7c76bc3decfc0317d7cf0e' 
  AND token = '0xn3lipKrWGDXsYIg9Lel6XiuL/iLeorxpmtMNZ/QgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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