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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43d1d5b80b6c0c1904fdcd8a64ba3d42fcb2bfc5da2f496b1827f222e0e2481c' 
  AND token = 'x4zlWtnJX2v8xDx7Or/ngETLYNrG9AQl9SAbgW2YTIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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