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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fae6bf3da5203972a601c606bff67f479574d7c079b8c0e13636cfa6b7d8d8a7' 
  AND token = '7rCKeYSaz+OdnY5axEmCR5prNfYF5rBIRFuxPx2f0G0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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