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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f1af85e183b3eebc9528a10d6f496a69367059028c8148fe194c334346c1ead' 
  AND token = 'Qf3bDzZIZVAG/Wl7s7ksjcRWyfoXLTDc7YztB234ujM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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