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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6bc916df44edc4bcbd28001ef949f8793c7e6c510a9391affa69dea849192c3' 
  AND token = 'jzbK0bJdVsByoqX+DDlW2Tleoo6Qxc7OJqJDi4LBxOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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