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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a38a8450508ddecbfbf749712665f7d0e72cc06cc9676a5e2fd1f68ced8fee' 
  AND token = '3JCNNkiAcei8BAIBYBBBSspCFmQKrftPUB6Z9y3ujXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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