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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '444c9d9ee30cea17c66bc03d0d175134b561c1e9897a9be8cefd902ad418d550' 
  AND token = 'D8+7tSwNWsrssSlRByI3kmUV1mRgvnaQg7Mi91uRSkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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