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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85e9b79f8fc23beba7254b8fd0b8ff24a9f99caff01cc0871bb8d0b2599dad55' 
  AND token = '4L+B9F3Z9s0IMxJB4mbLKEDcLBhvGK8Y+s6lSH1mwXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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