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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b5c18dd7e6fd4436926d803a54509b9860419a4c8ec97ad3811c967b577a07b' 
  AND token = 'lI/IptmzJnBxY1WFFDq3b2B+n3iikQh5ne8TeuqIE+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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