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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f09c32b1899073e175dba11ba397e3ab2a0a3ebf7db92d3ca5c927ad9164892c' 
  AND token = 'DxdIyEJfFjPjg10JWXALcIx9G9Bxl3BGW1nj0pmM7x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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