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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a18acb0bb240a6e75b3f6cc649a29540bc5db9a430bbd1b43572f7b8e1c4bbf' 
  AND token = 'XIsUuaT8SNPDUyfiWXohcEIiRW1H3gPSZ7qO3aR//bY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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