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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eb43e65b1559b8b4dbfd2110c8987b59d58e2bd2b47f0c85f2826a19864f9bf' 
  AND token = 'frAiVDj5fBuZnTKTClnLfhBADg5bpAjQEPQEPvWqSOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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