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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dd98c40eb8ba2af495cac876467438b67ed1826635b23f76dd5a2b4e352bc64' 
  AND token = 'wF9JhV73CalTwC4+xEund0imS/xKzcNIMqdqeU7YtT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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