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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac98c5e7a7e651062b3cf3aa5859e290a0bcf56e600a16d12f189b665c5f38f5' 
  AND token = 'dHtva4lK7ZdvFkJdl4MNZaJyJxcvz6Bp+wrNi9Xpsrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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