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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f70fb3f54b402cb99593b36ade9ea3f5705cbfeda60eb5529696f65a7d297770' 
  AND token = 'IYV4ZY2cpdOnM2cd69Jd/QpwzIbKuKCoGRQDUq5W2uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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