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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a305677f4d96b8e9b2654c06fb19951aec0c0f73325982862b4a5aa57c870f8' 
  AND token = 'oOsDhqg8GxwK52/S2DkvNnMTtiQNx9ylCOzo3QTr7TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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