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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f8ed15b61bcbca1f5a13f7578ba06f0a83da4f4a105b34efe9481d2a43de70e' 
  AND token = 'lFlMgboXftrJ4DNUg4aA8FOVer66nE/PGHNq9iiTkgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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