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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d67bf97fbb4fcd9d4352b97daf0c244c9e36331bc23200793ad7e2271df7253' 
  AND token = 'SOHUku4q7LK+BIEtCkaYUHx+tnqOf6/rSJSf0TMSQpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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