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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '201696f916c1e14ff6c558d2a51a2a1cc7b66436c0e7af0707a1dd9f496508fd' 
  AND token = 'jjQ0OkHEXixMaLXY8ExakWJe0Myr0Gkyoq3k6vNTj6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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