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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79cb30b67a84ecd7023df3442ff1d4063c17fb79c3e94193676ce5246cfd546e' 
  AND token = 'elt3EyCkmuL7E6fzSx2RmXt9thxh2LR+486iXXmK3OY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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