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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e471220ba9fb1b7a9ffe4c1e9e30f8effb79f11fea8a37a23a4127d9c19932a' 
  AND token = 'd/hb7pi95eGNDSd1txtCVDtFpX6p+0PKg+4B3f9Z7XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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