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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a565ee416943fa55a194addfb92d80c8a98a19f48f6f79ba9ce0d39f67d5c432' 
  AND token = 'I4aIEsRgz+JML8SQU2wwu32II4h6AkHcSr7spNlsdSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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