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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '891d19946e385bc164a979dc2ae10475d1093e9f49300f5509aec7fa810ab677' 
  AND token = 'GZU6umiQPAegyRvmt9u2nSU5r+PUDHjPuoGT46/P3/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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