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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f0d937be11bf0d1e11cf3fff0ee7aa57d7d8e84bbc30beb504c044cc852e26' 
  AND token = 'QUzg+9qukbPnnevfSLsrTe/pez5eydjBzCss87UAOo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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