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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3f52f9dec0959377d3c8c8af4b9ce324f2f18f8330ec5b4227401af2fc5e120' 
  AND token = 'ue8dOEda7QherzcTz31M5QsUpbrZuBY4DkK/gvMfNww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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