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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b135ce1c77df70373411b01766a423d2995e166b51294d23b3d8d28d38b0c930' 
  AND token = 'S+F5DFPXJjAnbDrwI6WAd3IHwRuhw7XLNEk29n9wMFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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