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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8724a8d60c66ece778d9894f7f6cfec93d98df97710d620c3862f3916fc69b04' 
  AND token = 'oQt5/DDxv79xGtfyMIhRLxys3OzfWHbxFTw0cHH+VDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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