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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47405ea2e8f66bb3a4fc0019866d3a9ad519ddce77a51049f91b29690ffe9fe3' 
  AND token = 'KgQDmp76R62uUDL24QqhJrQPXOi8uizlt7z9rzChRaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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