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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33aca01865ed0b57acc5266b904251cce8d3f8643a5ec967746dc22a741e42f2' 
  AND token = 'pESy2670ZvPSM5EPEbWnSjvhY5oHYGg86A6qnPb5ajg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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