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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b71a3a1c31c57a3d5405afbd81d907e320c0155510b1e4fdd34a88a7d59a03c9' 
  AND token = 'E3z5zLN82wd8sjIHyNNzNEQ9tmbljm6tIOEgxh/ZTJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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