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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40a17305e8d658dbd1553cfc38f791c8d54ee12789543150398dd7d425246a57' 
  AND token = 'eijG6mBXcEu7sl8K7v3+6xAUO6amJYGzePd/xdJWqdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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