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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c3c79bda218262e0f214717424cc343ee98c071ca5cd31e3f7f16c3be44051f' 
  AND token = 'w1FKFhbG9cuDzs7szB6LfE2bF4K2ctWenKRf4u9QzuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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