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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '338a7a4a500c60d5b68932ec371eba8b9a19281a05f710c3d6814e6711817ed5' 
  AND token = 'sKPaJFeUmgEmCUR6S+0QTstkxFMzmoQoqImPAGezyWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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