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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a998e2d96b26c0c79524da1d7975860b6673c93ae3370eee7924df64c1dae4d' 
  AND token = '/ilS+Xn0hO4muU8+xHE/rC/GtCurShP9aS+E1+yA8vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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