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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7c98acea9ee418666fd625ac48bf808d7c78fd039a30646143a2641d00988cb' 
  AND token = '0Bga0Y+Te/Vl1odynsjU+6ykqg6fg/XQVfznlbgxzwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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