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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06a4b2f703039cfb0d5c497c7589dca3cd029e1554d4af82597aae433551c7fc' 
  AND token = 'g7EJqCTP8GEK58ohh8GLzgrpAg7VhqynjXbzfPrE26g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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