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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd424509d0be30d5b9bee8128704b6ca5c26085ae584e3d4908f6fbcdce97b47c' 
  AND token = 'ofVKhrshgdbc4MmtX3PgaPw+RXXsiRnqqiWAxE5dELU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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