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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9851f39daf74065b2ba19a7c7964608b4b97b30e0750c3505580f71021e0ad13' 
  AND token = 'XtTnm25uwnmN1F/t51KF6DY8IwkofO6VhKEY62DJVYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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