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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23b5904d49c752c7d2775f3a8dfc1ca5d438bc59e924824923d83cfd89dd51b9' 
  AND token = 'ijmjmuyojeY0t60s/ysmekpd4T/O284wdzlgNphbMhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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