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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1751c9e4c58dcee09507b22341a5ba8458fbcaf0ae4e084463082caa733a7923' 
  AND token = 'JUPF/mgxm9GzoYBu+k59YDH8z1yAg2SHtY7N1vBkOOY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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